www.nuxcom.de
Page 1
June 25
th
2010
Construction manual antenna kit DBY5
3+4 element twinband yagi 28/50 MHz DK7ZB
Source: http://www.nuxcom.de/pdf/nuxcom-construction-manual-DBY5.pdf
You receive all parts you need for assembling the antenna. The material is not handled in any way and it
will be all your work and is on your own risk.
This manual is only a recommendation on how you can build up a working antenna with the delivered
parts. Individual adjustments are possible. In all cases the customer is responsible for the proper function
of the antenna.
All lengths and measurements of these antennas have to be followed
exactly, or you will not have the predicted results.
Mounting of boom and 28 MHz elements
Please follow the instructions in the manual “Short construction manual for 28 Ohm and 50 Ohm design 28
MHz (10m) and 27 MHz (CB) yagis”.
You can download this document on our website
http://www.nuxcom.de/pdf/nuxcom-construction-manual-10-11.pdf
Please follow the following hints:
a) Follow the instructions of the 50 ohm cable choke
b) Mount the coax socket directing to the reflector because on the other side you need the space for the
open sleeve element.
Mounting oft he 50 MHz elements:
Important information: Do not drill the hole for the 50 MHz open sleeve element into the boom before you
have made the fine tuning by finding the best distance between radiator and open sleeve element!
The 50 MHz elements are also tapered with 16mm and 12mm tubes. The middle part of the 16mm tube is
1m long, the 12mm tubes will be pushed into the 16mm tubes until they have the desired length according
to the table. The tubes are also fixed together with the hose clamps.
The elements are fixed to the boom with black polyamide
element clamps. First drill a centered 5,5mm hole through the
boom on the mounting point. Then put a flat washer on the
screw und push them through the element. Fix the element
clamp over the mounting hole on the boom. Attach the
element with the screw onto the element clamp so that the
screw comes out on the bottom side. Fix it with another flat
washer and the hex nut.
